h1{
    color:red;
    font-size: 72px;
    text-align: center;
}

.naw{
    height: 50px;
    width: 100%;
    background: cadetblue;
}

.nav li{
    height: 50px;
    width: calc(100% / 5);
    float: left;
    text-align: center;
    line-height:50px;
    list-style: none;
    font-size: 15px;
}

.nav li:hover{
    background:coral;
    color: #fff;
    font-size: 17px;
}

.submenu{
    height: 200px;
    width: 100%;
    background: yellowgreen;
    display: none;
}

.nav li:hover .submenu{
    display: block;
}